A few weeks ago, I think it was EricL who posed the question of using vibration damping material (e.g., Dynamat) or spray (e.g., Noisekiller) on the outside of the CAI tubing. I kept an eye on the thread for an answer, but never saw one.

Seems like it would be at worst ineffective, and at best able to quell some of the roar, and maybe even help insulate the interior of the tubing from heat (since the aluminum-lined "mat" style materials are purported to do so). Probably won't do much for the looks though .

Anyone tried this or have any thoughts?

Thanks,

e harmon

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Silver 2001 CL-S, Comptech Springs, M-6 and other superwhite bulbs here and there

 

I don't know about using Dynomat on the intake. Dynomat is applied with a heat gun, by having dynomat on a surface that tends to get hot, really hot, I doubt it would stick for very long.

Now, dynomat DOES sell a hood liner for cars, I don't know if they are a custom fit, or a cut it yourself deal. But I do know that they DO reduce the engine sounds big time!

Check it out!

 

Thanks for the advice, Jayru. Regarding the temperature of the tubing: does it reach ambient (underhood) temperature? Somehow the pictures I've seen of the Xephyr and AEM products lead me to think that they reject heat fairly well. That said, I'm sure getting mat-type material to stay on the tubing is probably challenging. I'm wondering if it would be worth it to try though...

I guess it kind of comes down to whether most of the noise is from the apertures at the extremities of the tubing, or from resonance within the tubing. Anyone know?

Thanks again,

e harmon



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Silver 2001 CL-S, Comptech Springs, M-6 and other superwhite bulbs here and there

 

You ask a good question. I would like to know as well.

When it came to the issues of "damping" material, I was thinking about some stuff that got used in non-automotive applications. I can't remember the name of the stuff, but it was a Barium material, with high temp backing (it came with adhesive and without). It was meant to be used as a "damper" to reduce/"damp-out" vibrations of metal, wood, and plastic materials that would "resonate".


I have a nasty suspicion, someone will have to get out a rubber house (poor man's stethoscope) and listen for the noise along the intake tract. If the noise comes from the tubing, then someone should be able to "fix-it".

If the noise is coming from the air intake, perhaps someone should think along the line of a gun silencer or other (low restriction) resonator.

If a small slat type/Helmholz resonator or other "cavity" system was used to only get at "hiss" or higher frequency waves, it should be possible to remove the noise with minimal loss in power.

I do know that the original system HAS a resonator, but it is a rather big one. I have a feeling that reduction in intake roar was its design purpose.

(yep, one big bunch of guesses. Just food for further thought.)


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2001 Satin Silver Cl-S w/ NAVI

• Mud Guards
• Wheel locks
• Toyo 235/45ZR17-97W* T1S Proxies on Stock 17" CLS wheels
• Gtech 1/8th tank 40F ~=6.1
• Zaino magic
• 14.8lb 17x8" SSR Competition rims on the way
• Sways, headers, CAI comming soon